Study on preparation and application of 160 MPa UHPC in coastal high heat environment
In order to prepare 160 MPa ultra-high-performance concrete that meets the application of high heat environment,UHPC with different components were prepared according to the requirements of Binhaiwan Bridge in Guangdong Province,and the tensile performance and microstructure of UHPC shaft with optimal ratio were studied,and the preferred ratio group was used for steel bridge deck paving.The results show that the CM2 admixtures can significantly improve UHPC fluidity,reduce the water-to-adhesive ratio,and reach the self-compacting state of the machine expansion,the 2 h expansion of UHPC mixtures in 32 ℃ environment is basically no loss,and the working performance is adapted to the pouring requirements of high heat environment.The compressive strength of UHPC cube after steam curing at 90℃ reaches 180 MPa,the tensile strength of the elastic section of the shaft tensile performance is 9.6 MPa,the ultimate tensile strength is 11.4 MPa,the ultimate tensile strain is 0.35%,and the ratio between ultimate tensile strength and the tensile strength of the elastic section is 1.9,which has obvious strain hardening characteristics.The improved production line and professional construction equipment can realize the large-scale preparation and construction application of 160 MPa-class UHPC.
万方数据
维普
